Mop bucket



FIG. 1 is a top, front, left perspective view of a mop bucket showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a left side view thereof.

The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken lines showing the remainder of the mop bucket are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a mop bucket, as shown and described. 